How to repair the Gause Rifle to Full durability?

I have the gause rifle from the new DLC "Operation: Anchorage" and it's awsome, but the only problem is, I cant find another one anywhere in the game to repair it with. Also, I cant find a vendor that can repair things to full durability. What should I do to repair it completely? (If anything)

either you do A. talk to uncle roe at canterberry commons and talk to him about investing in trade vans and invest in crazy wolfgang (when you invest in him his repair skill will be at 75 but also note it costs ALOT of caps to do this!) or B. get the DLC mothership zeta and find some alien proxy to repair your gun. other than that, you can always go to megaton and go into the craterside supply and talk to moria brown and have her repair stuff for you (since i think she has the highist repair skill if you don't invest in a trade van).